Adjustable drill-jig



e. E. SWARTZ.

ADJUSTABLE DRILL IIG.

APPLICATION FILED AUG.6. I917.

Patented Aug. 12, 1919.

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GUY E. SWARTZ, 0F DETROIT, MICHIGAN.

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Specification of Letters Patent.

Patented Aug. 12, 1919.

Application filed August 6, 1917. Serial No. 184,720.

To all whom it may concern:

Be it known that I, GUY E. SWARTZ, a citizen of the United States of America, re siding at Detroit, in the county of Wayne and State of Michi an, have invented certain new and usefu Improvements in Adjustable Drill-Jigs, of which the following is a. specification, reference being had therein to the accompanying drawings.

This invention relates to adjustable jigs for holding work to be operated upon and refers more particularly to a new and improved adjustable and universal jig of the character above referred to.

Among the objects of the invention are to provide an'improved means for quickly and accurately clamping and releasing the work; to provide a. construction which can be adjusted to different heights to take care of different sizes of members to be held; to provide a construction having interchangeable adapters for holding work of various kinds, these adapters being preferably adjustable for height with the movable member of the -jig; to provide a construction wherein the work is clamped by spring actions, also in combination with a lever cam or other suitable member for moving the adjustable member back against the tension of the spring when it is desired to release the work.

The invention also resides in such other features of construction and arrangements and combinations of parts as will more fully hereinafter appear.

In the drawings:

Figure l is an end elevation, partly in section of a device embodying my invention;

Fig. 2 is a fragmentary elevational view of the construction shown in Fig. 1;

Fig. 3 is a fragmentary top plan view;

Fig. 4 is a top plan view of the releasing lever;

Fig. 5 is a fragmentary horizontal section on the line 5-5 of Fig. 1.

Describing in detail the particular construction shown in the drawings, A desig' nates the bed plate or stationary member of the jig which is provided with a seat B formed to receive-an adapter C which can be of any desired form to suit the work. The adapter is removably held in the seat B by a locking bolt or set-screw D. Extending upward from the bed plate A. is a post E upon which there is slidably mounted the movable member F of the jig. T his movable or clamping member F is also provided with a seat G for receiving interchangeably a sired; also the base B .is provided with apin or post B serving as a stop to keep the work from rotating with the drill.

As shown in Fig. 1 the work, such as the bracket I, is clamped between the adapters C and H, the clamping member F being forced toward the stationary member or bed plate A by means of any suitable spring arrangement, as for instance, by the spiral coil spring J. The latter is sleeved upon the post E and has its upper end bearing a ainst an adjustable locking nut J. This loc ing nut is turned down on the threaded end E of the post E a sufiicient distance to compress the spring and thus cause the latter to normally spring-press the clamping member F toward the bed plate. In addition to the post E the clamping member F is guided by a post or guide bar K having flat sides K engaged by a recessed portion K on the clamping member F.

After moving the clamping member back from the work and against the tension of the spring J, I preferablly employ a lever L pivotally connected at to the clamping member F and pivotally connected at L to lifting rods L and L which extend through the clamping member F and by a toggle link M to the base A at M. Thus when the operator desires to lift the clamping member F to release the work he pushes down upon the lever L which, operating on the link M as a fulcrum, forces the clamping member F upward, withdrawing the adapter or holder H so as to release the work. To compensate for adjustments of the nut J to take care of clamping articles of different sizes, the lifting rOds L and U have their upper end threaded to adj ustably receive the looking nuts ll and N. For holding the upper adapted in the seat G, I employ a setscrew 9., similar to the set-screw D for the lower adapter. Thus both the stationary and movabie members are provided with interchangeable adapters and the normal position of the upper clamping member can be adjusted to various spaced relations with reference to the base A. However, While I have shown and described a jig having a single post, the invention in certain of its aspects is not limited to this particular type but could be used as stationary, revolving or multiple types, particularly adapted for contlnuous loading. Various changes in the details of construction covering the above types can also be made Within the scopeof the claims.

What I claim as my invention is 1. A combined adjustable and universal jig having a stationary member, a coacting movable clamping member, a post projecting from the stationary member and forming a guide for the clamping member, a "spring coiled upon said post bearing at one end upon the clamping member to press the same toward the stationary member, an adjusting nut engaging a threaded portion of the post forming an abutment for the other end of said spring, and lever mechanism for adjusting the movable clamping member away from the work against the tension of the spring.

2. A jig comprising a stationary member,

a coacting movable clamping member, a post on said stationary member carrying pring orene? pressing said movable member toward the stationary member for clamping the Work therebetween, an abutment for the other end of said spring adjustable upon said post, and lever mechanism for adjusting the movable member away from the Work against the tension of said spring. 7

3. A combined adjustable and universal jig having a stationary member, a coacting movable clamping member, a coil spring acting at one end. on said clamping member to urge the same toward the stationary memher, an abutment for the other end of said a spring adjustable as regards its distance from the stationary member, an actuating member for the movable clamping member, and a connection between the actuating member and movable clamping member adjustable as regards its connection to one of said members to permit a variation of the working position of the movable clamping member.

In testimony whereof I afix my signature.

GUY SWARTZ. 

